feat: add flags for since and limit

Co-authored-by: Vegar Sechmann Molvig <vegar.sechmann.molvig@nav.no>

build: allow manual trigger of workflow

build: remove name where not needed

build: bump to latest github.com/pterm/pterm

docs(alpha): add description

feat: support postgresql 18 as it's now available in Cloud SQL

fix: Point to nais doc about how to test the new instance after setup

fix: place aivenapp secret in correct field

feat(alpha): register apply, opensearch and valkey subcommands

build: remove unused variable